I am looking for a place to find tracks. For example bass and keys on tracks. I can find karaoke type stuff that has the full track without the lyrics. Is there a place you can buy the individual instrument tracks for each song?

I am looking for a place to find tracks. For example bass and keys on tracks. I can find karaoke type stuff that has the full track without the lyrics. Is there a place you can buy the individual instrument tracks for each song?